From b5df2f95881dbea5192d1b5c20f1495381d1117b Mon Sep 17 00:00:00 2001
From: Duygu Ramadan <duygu.ramadan@sap.com>
Date: Wed, 10 Sep 2025 13:24:50 +0300
Subject: [PATCH] fix(ui5-side-navigation): Prevent TypeError when selected
 item has no DOM

fixes: #12261
---
 packages/fiori/src/SideNavigation.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/fiori/src/SideNavigation.ts b/packages/fiori/src/SideNavigation.ts
index 12d1437d8409..4aa810a26f6a 100644
--- a/packages/fiori/src/SideNavigation.ts
+++ b/packages/fiori/src/SideNavigation.ts
@@ -534,9 +534,11 @@ class SideNavigation extends UI5Element {
 
 		if (selectedItem) {
 			const selectedItemDomRef = selectedItem.getDomRef();
-			const { marginTop, marginBottom } = window.getComputedStyle(selectedItemDomRef!);
 
-			itemsHeight += selectedItemDomRef!.offsetHeight + parseFloat(marginTop) + parseFloat(marginBottom);
+			if (selectedItemDomRef) {
+				const { marginTop, marginBottom } = window.getComputedStyle(selectedItemDomRef);
+				itemsHeight += selectedItemDomRef.offsetHeight + parseFloat(marginTop) + parseFloat(marginBottom);
+			}
 		}
 
 		overflowItems.forEach(item => {